Dimensional formula [M⁰L⁰T⁰] represents: MCQ with Answer and Explanation
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Question #1
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Gravity work for horizontal motion:
Correct Answer: Option C
Explanation:
Gravity acts vertically; horizontal displacement ⇒ angle = 90° ⇒ W = Fd cos90° = 0. No work for perpendicular force-displacement. Memory aid: 'Work = Fd cosθ; θ=90° ⇒ W=0'. Mechanics concept frequently tested to correct misconception that force always does work.
Gravity acts vertically; horizontal displacement ⇒ angle = 90° ⇒ W = Fd cos90° = 0. No work for perpendicular force-displacement. Memory aid: 'Work = Fd cosθ; θ=90° ⇒ W=0'. Mechanics concept frequently tested to correct misconception that force always does work.
Question #2
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Mercury is used in thermometers because it
Question #3
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Photoelectric threshold frequency ν₀ = φ/h. If work function doubles, ν₀:
Correct Answer: Option C
Explanation:
ν₀ ∝ φ. Double work function ⇒ double threshold frequency. Higher φ requires higher photon energy for emission. Memory tip: 'ν₀ = φ/h; larger φ ⇒ higher frequency needed'. Photoelectric effect relation frequently tested in competitive quantum physics sections.
ν₀ ∝ φ. Double work function ⇒ double threshold frequency. Higher φ requires higher photon energy for emission. Memory tip: 'ν₀ = φ/h; larger φ ⇒ higher frequency needed'. Photoelectric effect relation frequently tested in competitive quantum physics sections.
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